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Note 5 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 03, 2014
Number of Suspended Saltwater Injection Wells 2       2
Accounts Receivable, Allowance for Credit Loss $ 300   $ 300    
Contract with Customer, Asset, after Allowance for Credit Loss 790 $ 747 567 $ 599  
Contract with Customer, Liability 5,200   3,400    
Customer Advance Deposits [Member]          
Contract with Customer, Liability $ 1,311 $ 1,082 1,223 $ 965  
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member]          
Concentration Risk, Percentage 14.00%        
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Two Customers [Member]          
Concentration Risk, Percentage   32.00%      
Customer Concentration Risk [Member] | Revenue Benchmark [Member]          
Number of Major Customers 1 2      
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]          
Concentration Risk, Percentage 10.00%        
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member]          
Concentration Risk, Percentage   22.00%      
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]          
Concentration Risk, Percentage 9.00%        
Waste Management Services [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 66.00% 69.00%      
Accounts Receivable, after Allowance for Credit Loss $ 9,000   $ 8,400    
Waste Management Services [Member] | Maximum [Member]          
Contract Term (Year) 1 year        
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member]          
Number of Major Customers 1 2      
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member]          
Concentration Risk, Percentage 14.00%        
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Two Customers [Member]          
Concentration Risk, Percentage   32.00%      
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]          
Concentration Risk, Percentage 9.00%        
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member]          
Concentration Risk, Percentage   22.00%      
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]          
Number of Major Customers 1   0    
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]          
Concentration Risk, Percentage 14.00%        
Golf and Related Operations [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 34.00% 31.00%      
Number of Golf Courses 4        
Accounts Receivable, after Allowance for Credit Loss $ 3,300   $ 1,100    
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]          
Number of Major Customers 0 0      
Membership Agreement, Term 1 year        
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]          
Number of Major Customers 0   0